I have just fitted a pipercross airbox to the MNR R1 and it looks as if there is now enough room to fit a set of standard air intake ducts.
Am I right in thinking they are a good thing as they allow a higher vortex to get the fuel in more efficiently?
Does anyone know if they are preferable or not?
Actually, does anyone know how high they are??
Just want things sorted before tuning.
Cheers

Or are they called velocity stacks? I mean the pipes above the air intake for each carb.

Fit them, they are part of the induction system and effect the inlet tract length, later R1's have variable length trumpets to vary BHP/Torque depending on where you are in the rev range, so they do change engine characteristics. You need a couple of inches at least between to stack mouth and the filter, there is a harmonic effect which too close a filter will spoil.

Just put the tank back on that << could have measured them yesterday....

[Edited on 3/7/08 by r1_pete]

you need 1 or 1.5 times the throttle diameter's space between the trumpets and a solid surface. If there is room, fit them. The curved inlet of the trumpet smooths air flow into the engine, meaning at high revs you can get more air in, and more fuel.

Be ware, you might have to re-jet or remap if you improve air flow.

Also, make sure the inlet to the airbox is radiused. if not, make one. It will improve air flow.

The air box is a pipercross effort with side (or pointing to front of car) entry. This is fed by quite a straight flexible pipe 7.5cm diameter) with a radiused inlet fitted in the nose mesh.
It is not ideal but the best I can manage.

The airbox is 7.5cm high, the throttle diameter is 4cm. From pictures I guesstimate the trumpets are about 4cm high leaving 3.5 to the roof of the box when the trumpets are on, does that sound enough?

Thanks guys